CDC MAsk decontamination reviewed
The CDC reviews the filtration performance and germicidal effectiveness of various decontamination methods, including vaporized hydrogen peroxide, UVGI, microwave and more.
Link: Decontamination and Reuse of Filtering Facepiece Respirators
Dr. Peter P. Tsai, inventor of the electrostatic charging technology that makes the filter media of face masks including medical and N95, answers questions about N95 reuse. Avoid alcohol, but dry heat (65C for 30 min), steam and boiling water for 3 minutes work. UV possible, but needs testing.
Link: Dr. Peter P. Tsai Q&A
Virus deactivation with SALT
Dr. Fu-Shi Quan published an article in 2017 Nature regarding deactivation of influenza virus with salt, leading to possible mask reuse. Not strictly DIY, but methods describe pre-treating with NaCl, distilled water and Tween 20 (polysorb 20) as surfactant.
Link: Universal and reusable virus deactivation system for respiratory protection